Barbers cannot stockpile extra ones during their slow hours and thus accidentally exceed the quantity demanded.

FORBES: The Real Impact of Quantitative Easing (Next to Nothing!)

The cost of extra safety investment may slow Arctic drilling for a while, especially as we are in a glut of cheap shale gas.

BBC: MPs' call to halt Arctic drilling amid safety concerns

Sky Go Extra still works at slow internet speeds - however, Sky's other streaming services rely on the user having a 2 megabit per second connection.

BBC: Sky logo